Bok choy is popular as “baby bok choy.” There is no “adult bok choy,” but there are jokes.
     
“Has anyone seen adult bok choy?” was posted on Twitter by [Neutral face] on May 24, 2010. “You don’t hear much about adult bok choy these days…” was posted on Twitter by Jimbo’s…Naturally! on December 13, 2011. “What’s the deal with baby bok choy? Is adolescent or adult bok choy no good?” was posted on Twitter by Tedb0t on December 13, 2016. “Nobody ever asks for an adult bok choy” was posted on Reddit—Showerthoughts on October 5, 2018.
   
   
Wikipedia: Bok choy
Bok choy (American English), pak choi (British English), pichay/petsay (Filipino), or pok choi (Brassica rapa subsp. chinensis) is a type of Chinese cabbage. Chinensis varieties do not form heads and have green leaf blades with lighter bulbous bottoms instead, forming a cluster reminiscent of mustard greens. Chinensis varieties are popular in southern China, East Asia, and Southeast Asia. Being winter-hardy, they are increasingly grown in Northern Europe.
     
Twitter
[Neutral face]
@we135b
Has anyone seen adult bok choy?
11:11 PM · May 24, 2010·Echofon
   
Twitter
Jimbo’s…Naturally!
@JimbosNaturally
You don’t hear much about adult bok choy these days…
3:53 PM · Dec 13, 2011·Twitter Web Client
   
Twitter
Jeff Mc
@JeffMcElfresh
For the record, baby bok choy is not as good as adult bok choy.
12:23 AM · Apr 18, 2012·TweetDeck
   
Twitter
Tedb0t
@t3db0t
What’s the deal with baby bok choy? Is adolescent or adult bok choy no good?
11:04 AM · Dec 13, 2016·TweetDeck
   
Twitter
Devyn on Earth
@DevynonEarth
Wait, who eats adult bok choy?
12:30 PM · Nov 30, 2017·Twitter Web Client
 
Reddit—Showerthoughts
Posted by u/dontnormally October 5, 2018
Nobody ever asks for an adult bok choy
 
Twitter
Mili
@millsspatel
“I don’t know what adult bok choy even looks like”
#shitshivalisays
1:20 AM · Apr 15, 2019·Twitter Web App
 
Twitter
toby maguire
@OchiEnzConchoba
Where did all the adult bok choy go?!?!
8:37 PM · Jun 27, 2019·Twitter for iPhone
 
Twitter
Tee McBee
@T_McBee
Cooking tip! Baby bok choy is not as bitter as adult bok choy because it has hope inside it still.
12:10 PM · Jul 1, 2019·Twitter for iPhone
 
Twitter
Mario Speedwagon
@SilipigniMario
Is there adult bok choy?
8:59 PM · Jun 8, 2020·Twitter for Android
 
Twitter
I’m Just Dan
@DanielAshley13
Replying to
@SilipigniMario
Yes.  The only difference is the size of the leaves.  It’s not called “adult” bok choy.  It’s just “bok choy.”  Fascinating question.  I can’t believe I never looked that up before. 
9:09 PM · Jun 8, 2020·Twitter for Android
 
Twitter
SEH
@seh
I added an extra $10 to my grocery delivery tip because the person doing the shopping texted “Hey they’re all out of baby bok choy, but they have adult bok choy, you want them instead?”
12:47 PM · Apr 20, 2021·Twitter Web App